Piwigo encountered a non recoverable error

[mysql error ] 
Can't connect to server

#1	my_error /mnt/107/sdb/a/f/lucmorizur/piwigo/include/common.inc.php(119)
#2	include_once /mnt/107/sdb/a/f/lucmorizur/piwigo/index.php(26)

Fatal error: [mysql error ] Can't connect to server #1 my_error /mnt/107/sdb/a/f/lucmorizur/piwigo/include/common.inc.php(119) #2 include_once /mnt/107/sdb/a/f/lucmorizur/piwigo/index.php(26) in /mnt/107/sdb/a/f/lucmorizur/piwigo/include/functions_html.inc.php on line 428